Physics problems in grade one of senior high school 6. When a, B and C move at a constant speed, the velocity of a is 6m / s and the acceleration is 1m / S2; the velocity of B is 2m / s and the acceleration is 6m / S2; the velocity of C is - 4m / s and the acceleration is 2m / S2 A. When passing through point a, object a is the fastest and object B is the slowest B. The object C is the fastest and the object B is the slowest when it passes l s before point a C. One second after passing point a, object B is the fastest and Object C is the slowest D. None of the above is true The answer is ABC, why? The analysis says that the velocity of a is 5m / s in the second before passing through point a, and it is 7m / s in the second after passing through point A. is it the law of decreasing in the second before and increasing in the second after?

Physics problems in grade one of senior high school 6. When a, B and C move at a constant speed, the velocity of a is 6m / s and the acceleration is 1m / S2; the velocity of B is 2m / s and the acceleration is 6m / S2; the velocity of C is - 4m / s and the acceleration is 2m / S2 A. When passing through point a, object a is the fastest and object B is the slowest B. The object C is the fastest and the object B is the slowest when it passes l s before point a C. One second after passing point a, object B is the fastest and Object C is the slowest D. None of the above is true The answer is ABC, why? The analysis says that the velocity of a is 5m / s in the second before passing through point a, and it is 7m / s in the second after passing through point A. is it the law of decreasing in the second before and increasing in the second after?

According to the speed formula of uniform speed change linear motion
The content of V (T) = V (0) + at () denotes the subscript
When passing through point a, the speed of the three is 6 2 4, so the positive and negative of the correct vector of option a does not indicate the size, but only the direction
According to the formula V (a) = V (the second before a) + at, the velocity of point a in the first second is 5-46, so B is correct
In the same way, the next second is still based on the formula 7 8 - 2, so C is correct
The direction of velocity and acceleration should not be ignored when the formula is used